Electricity and Magnetism Answers

An antiproton is a proton antiparticle. The antiparticle of a particle has the same mass as the particle, but with the opposite charge. When an antiproton encounters a proton, annihilation occurs: the particles disappear and gamma radiation is generated. Therefore, when studying antiprotons, it must be possible to keep the antiprotons separate from ordinary material. This is accomplished by putting the accelerated antiprotons in a magnetic field to orbit a very good vacuum. How large must the diameter of such a vacuum chamber be in order to store antiprotons at a speed of 16 km / s in a magnetic field? The magnetic flux density of the magnetic field is 1.9 mT. 

Near the equator, The field lines of the Earth's magnetic field are approximately horizontal to the north and the magnetic flux density is 50 μT. How large and in what direction must the speed of the electron be in order for the force caused by the magnetic field to cancel out the gravity acting on the electron?

What is a linear conductor? Discuss the conditions under which a metal does not 

behave as a linear conductor.

What is the magnitude of the induced E.M.F of a coil of inductance 30mH in which the current changes from 6A to 2A in 2 seconds?

A changing current induces an E.M.F of 10v across a 0.25H inductor. What is the rate at which the current is changing?

A beam of protons, each of which has mass m, and charge qe moving with a velocity V enters perpendicularly a uniform magnetic field with the magnitude B= 2uT directed into plane of the page. After the beam exits the magnetic field, leaving the field in a direction perpendicular to its original direction, the beam enters a uniform electric field with the intensity E = 2.10-8 V/m directed downward existing above a distance d=10 m. The beam travels a distance of 6 cm in the magnetic field. After the proton beam exits the magnetic field, what will be passing time till the proton beam stops in the electric field? (Neglect the effect of gravitation).

Using Maxwell’s equations in free space, derive the wave equation for the

y-component of the electric field vector.

A uniform plane electromagnetic wave of 100 MHz travelling in free space strikes 

a large block of a material having  = 4 0,  = 9 0 and  = 0 normal to the surface. 

The incident electric field vector is given by 

E = 500 cos (t – y) 

z

ˆ

Vm1

Write the complete expressions for the reflected and transmitted electric field 

vectors, and the incident, reflected and transmitted magnetic field vectors.

The average peak current in a lightning strike is 15 kA. What is the magnitude of the magnetic flux density at a distance of 10 meters from the flash channel? What about 100 meters from the flash channel?

You have a 12V battery connected to a single straight nichrome wire in your heater. If the wire is a millimeter thick and a meter long, and you placed a device that measures magnetic field strength at a 1cm distance away from the wire, what will be the reading on this device?